Pump device
AssigneeNidec Instruments Corporation
InventorNaoya Isaji
Life of this patent
Estimating the term…
Abstract
A pump device includes a motor having a rotor and a stator, and an impeller which is disposed in a pump chamber and is integrally rotated with the rotor. The rotor includes a rotor member having a first cylindrical part and a drive magnet surrounding the first cylindrical part. A radial bearing is held on an inner side of the first cylindrical part. The drive magnet has a second cylindrical part surrounding an outer periphery of the first cylindrical part and a ring-shaped rib which protrudes from an end of the second cylindrical part to an inner side. The rotor member has a seat part, which protrudes from the first cylindrical part to an outer side and supports an end of the second cylindrical part, and a caulked part which is enlarged from the first cylindrical part to an outer side and is overlapped with the ring-shaped rib.
Claims9
A pump device, comprising:
- a motor having a rotor and a stator surrounding an outer peripheral side of the rotor;
- and
- an impeller which is, when a direction along a rotation axis of the rotor is defined as an axial direction, disposed in a pump chamber provided on one side in the axial direction with respect to the stator and is integrally rotated with the rotor;
- wherein the rotor comprises a rotor member provided with a first cylindrical part extending in the axial direction and a drive magnet surrounding an outer periphery of the first cylindrical part;
- a radial bearing is held on an inner side of the first cylindrical part;
- the drive magnet comprises a second cylindrical part, which surrounds an outer periphery of the first cylindrical part and extends in the axial direction, and a ring-shaped rib which protrudes from an end on an other side in the axial direction of the second cylindrical part to an inner side in a radial direction;
- the rotor member comprises a seat part which protrudes from the first cylindrical part to an outer side in the radial direction and supports an end on one side in the axial direction of the second cylindrical part, and a caulked part which is enlarged from an end on the other side in the axial direction of the first cylindrical part to an outer side in the radial direction and is overlapped with the ring-shaped rib from the other side in the axial direction;
- a space in the radial direction is provided between the first cylindrical part and the second cylindrical part;
- the space functions as a flow path groove in which a fluid of the pump chamber flows;
- and
- the flow path groove is closed on the other side in the axial direction by the ring-shaped rib and the caulked part.
A pump device, comprising:
- a motor having a rotor and a stator surrounding an outer peripheral side of the rotor;
- and
- an impeller which is, when a direction along a rotation axis of the rotor is defined as an axial direction, disposed in a pump chamber provided on one side in the axial direction with respect to the stator and is integrally rotated with the rotor;
- wherein the rotor comprises a rotor member provided with a first cylindrical part extending in the axial direction and a drive magnet surrounding an outer periphery of the first cylindrical part;
- a radial bearing is held on an inner side of the first cylindrical part;
- the drive magnet comprises a second cylindrical part, which surrounds an outer periphery of the first cylindrical part and extends in the axial direction, and a ring-shaped rib which protrudes from an end on an other side in the axial direction of the second cylindrical part to an inner side in a radial direction;
- the rotor member comprises a seat part which protrudes from the first cylindrical part to an outer side in the radial direction and supports an end on one side in the axial direction of the second cylindrical part, and a caulked part which is enlarged from an end on the other side in the axial direction of the first cylindrical part to an outer side in the radial direction and is overlapped with the ring-shaped rib from the other side in the axial direction;
- the impeller comprises a flange part provided at an end on one side in the axial direction of the rotor member and a blade wheel fixed to the flange part from one side in the axial direction,
- the first cylindrical part comprises a connection part extending in the axial direction between the flange part and the seat part and a magnet holding part fitted to an inner side of the drive magnet,
- the radial bearing is held on an inner side of the magnet holding part,
- an inside of the connection part is a first space into which a fluid of the pump chamber flows through a through-hole penetrating through the connection part in the radial direction, and
- the first space communicates with a bearing cooling flow passage which is penetrated through the magnet holding part in the axial direction.
Dependencies are inferred from the claim text.